How does a bird develop without a placenta and is connected to its mothers blood supply?

Pentane with molecular formula c5h12, exists in three isomeric forms. one shows linear carbon chains, another has one -ch3 groups present on the third carbon atom, and the third has two -ch3 groups present on the second carbon atom. what types of isomers are these? a. geometric isomers b. structural isomers c. halotropic isomers

In what cells is the human genome located?

Modern sea star larvae resemble some primitive vertebrate larvae. this similarity may suggest that primitive vertebrates